You're more generous

According to an article in the Journal of Personality and Social Psychology, "individuals who are more embarrassable... behaved more generously than their less embarrassable counterparts" by giving away more of their raffle tickets in a study.

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You seem more trustworthy

A 2011 study pitted participants against a computer for a classic prisoner's dilemma: if you condemn your opponent you walk free, if you rat each other out you both get two years in prison, and if you both stay silent you both only get one year. Participants were more likely to trust a blushing opponent than a nonblushing one.